I used to have this game running very smoothly on my 6000x2 and my 9800gt @ 1280x1024. Just installed on Vista with my X3 8750, 9800gt @ 1680x1050 and the game is basically unplayable because of a strange problem. It keeps going slow(down to 15FPS) and then back to normal performance(around 55FPS) very quickly and continues to do so. Its obviously a core affinity problem but, setting my chip to two cores...the problem remains and setting it to just one, It smooths out a bit, still with speed issues and its only pushing 33frames which I know is to low for this setup. Can anyone help with this issue as I love a bit of GRID action and this is peeing me off

Thanks for the input but its not that I'm afraid. I should have said I have tried it at all graphics settings and even with fps in the 100s on low settings it speeds up and slows down so I think its a processor issue....Its like a core affinity issue but I cant seem to resolve it. Anyone else with a tricore fancy chipping in with some help?

Also one way to test and know for a fact that its a badly optimized core...is to disable multicore in BIOS and play the game. Im betting the stutter is gone, although your framerate will drop with loss of core, at least you know a driver update will fix it.